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Journal of BIOLOGICAL RESEARCHES ISSN: 08526834 | E-ISSN:2337-389X Volume 21| No Journal of BIOLOGICAL RESEARCHES ISSN: 08526834 | E-ISSN:2337-389X Volume 21| No. 1| December | 2015 Review Article SPECIATION AND ZOOGEOGRAPHY OF AMPHIBIAN IN SUNDALAND Nia Kurniawan1*, Driyana Rike Ahmadlia2, Day Shine Nahari3, Anggun Sausan Firdaus1 1Biology Department, Faculty of Mathematics and Natural Sciences, University of Brawijaya 2Biology Department, Faculty of Sciences and Technology, Islamic State University Maulana Malik Ibrahim 3Chemistry Department, Faculty of Sciences and Technology, Islamic State University Maulana Malik Ibrahim Veteran Street, Malang 65145, East Java, Indonesia ABSTRACT Sundaland is an interesting area to be explored based on its geological history, topography, and climate. Sundaland con- sists of Penisular Malaysia, Sumatra, Borneo, and Java which experienced some emergence and submergence process in the past. During 1981-2015, most of research in Sundaland found that amphibian family in Sundaland was dominated by Bufonidae, Ranidae, Microhylidae, Megophrydae, Rachophoridae, and Dicroglossidae which experienced lot of spe- ciation in its history. Among of 4 major islands in Sundaland, Borneo has the highest number of species diversity, then Peninsular Malaysia, Sumatra, and Java. During those years, Sumatra and Java got least concern by researcher. There- fore, it is suggested for further study to explore more in Sumatra and Java. Keywords: Sundaland, amphibian, speciation, zoogeography. INTRODUCTION Amphibian composition in Sundaland is the result of amphibian exchange at Plio-Pleistocene period (Wilting et The history of Sundaland has begun at the Early- al., 2012; Brandon and Jones, 1996). There were several Cenozoic (approximately 65 mya). It was merged with the factors which influenced amphibian composition in southern end of Eurasia continent (Hall, 1996). During Sundaland, they are geological history of Sundaland and Pliocene and Pleistocene period, Sundaland was a large tropical climate which affected on the other geological single landmass. Since the rise of sea level in glacial factors, such as ancient river system and climate. Beside period, Sundaland dispersed into Java, Borneo, Sumatra, that, supervulcanic eruption also gave some influence Malay-Peninsula, and some adjacent islands (Molen- (Woodruff, 2003; Lohman et al., 2008). This chapter will graaff, 1916). discuss about speciation and zoogeography of amphibians Sundaland has dispersed along the equator line with in Sundaland, despite on its geological history and mountains and rivers on it. Sundaland has tropical climate amphibian diversity (especially amphibians).Amphibian and seasonal wind. During glacial Pleistocene, the climate composition in Sundaland is the result of amphibian ex- has predicted to be cooler and drier, except in Sumatra, change at Plio-Pleistocene period (Wilting et al., 2012; West Borneo, and North Borneo which have wet climate. Brandon and Jones, 1996). Most of Sundaland included to monsoon climate area and the rest northern area with equatorial climate. The difference is on its rain cycle in the monsoon climate SPECIATION OF AMPHIBIAN IN region. Climate in Sundaland is fluctuative between SUNDALAND cooler-drier periods and warm-wet periods. Both of the Speciation in Sundaland was predicted has begun periods has influenced the occurrence of tropical forest when the process of land connecting and separating as the area as habitat of Sundaland amphibian in the past. On the result of sea-level fluctuation since Eocene until other side, warmer climate in Sundaland causes it has Pleistocene period (Wilting et al., 2012; Ruedi, 1996). high biodiversity. Warmer climate provide more food and Both of these processes end with allopatric speciation constant temperature in a year. Thereby, Sundaland has which caused by physical barrier (such as topography, high biodiversity than other subtropical regions (Lohman water, and landmass), it leads to the formation of genetic et al., 2011). reproduction barrier. Futuyama (2005) explained in his book “Evolution” that natural selection and genetic drift Corresponding Author: have caused the divergence in genetic composition. When Nia Kurniawan a region is separated in a long period of time Biology Department, Faculty of Mathematics and Natural Sciences, Brawijaya University (geographically) it will form new species as the result of Jl. Veteran, Malang 65145, East Java, Indonesia allopatric speciation. phone : +6282142452370 Amphibian research in Sundaland has started since e-mail : [email protected] the 18th until 20th century (today) and has completed the database of amphibian. There are 6 families which found Open Access www.berkalahayati.org 1 Speciation and Zoogeography of Amphibian in Sundaland in Sundaland (Bufonidae, Ranidae, Megophrydae, estimated have some species resulted from speciation in Microhylidae, Dicroglossidae, and Rhacophoridae) with their developmental process. Percentage of each family in the high similarity on their characters and high species Sundaland (total species in Sundaland) since 18 century diversity in every island. During the 18th until 20th century was Rhacophoridae 25%, Ranidae 20%, Bufonidae 18%, some studies showed that Sundaland has 301 species of Microhylidae 14%, Megophrydae 12%, and amphibian (from 6 large families) approximately which Dicroglossidae 11% (Figure 1.a). some of them are endemic species. Each family was Figure 1. a) Percentage of amphibian species based on distributed family in Sundaland; b) Percentage of new species which distributed in Sundaland. bution i (%) Percentage Distr Species of Figure 2. Percentage of species distribution in amphibian based on 6 main family (Bufonidae, Ranidae, Megophrydae, Microhylidae, Rhacophoridae, and Dicroglossidae) in 4 major islands (Malay Peninsular, Borneo, Sumatra, and Java) and adjacent island. Rhacophoridae distributed almost in all 4 major islands (Teynie et al., Rhacophoridae family has the highest species 2010; Streitcher et al., 2014; Harvey et al., 2002). diversity in Sundaland compared with five other families Philautus and Rhacophorus were genera with the (see Figure 1.a). It consists of ±6 genera (Nyctixalus, highest number of densityin Sundaland compared with Phlautus, Polypedates, Rhacophorus, Theloderma, and other genera (Teynie et al., 2010). Rhacophoridae has Chiromantis) with total ±74 of species. Some species in highcharacter similaries among its species member which Rhacophoridae have been predicted as endemic species in predicted as the result of geological condition of Sumatra and Java. Species which predicted as endemic in Sundaland that led to speciation. Philautus ingeri is one Java were Philautus jacobsoni, Philautus pallidipes, of the example speciation results which found at Sarawak Philautus vitiger, and Rhacophorus javanus (Kurniati, (Borneo) and predicted as P. hosei by Dring (1987). 2006), while Sumatra has Rhacophorus achantharrena, Another example is Philautus mjobergi which identified Rhacophorus barisani, Rhacophorus bifasciatus, by Smith (1925) from Borneo, it first known as P. Rhacophorus bengkuluensis, Rhacophorus catamitus. aurifasciatus (Bossuyt and Dubois, 2001). High Rhacophorus, Polypedates, and Theloderma genera have similarityof their morphological characters sometimes wide distribution area in Sundaland, because they are cause misidentification. Morphological similarities of the species were predicted as the result of speciation process, BIOLOGICAL RESEARCHES | Volume 21 | Number 1 | December | 2015 Journal of 2 Kurniawan et al. as described by Darwin that evolution was originated distribution in Malay Peninsula, and Borneo predicted from the ancestor which have changed and developed caused by the geological history of Sundaland. (Coyne, 2009). Ansonia breeds in stocky stream which facilitated by land mass of Riau-Bangka-Karimata arcs and Anambas- Ranidae Natuna arcs. Genetical exchange of Ansonia was Ranidae consists of ±7 genera which spread widely predicted occurred when Borneo and Peninsular Malaysia in Sundaland (Amolops, Huia, Hylarana, Staurois, were separated from Sumatra and Javathen caused Meristogenys, Odorrana, and Rana) with ±61 species. allopatric speciation (Inger and Voris, 2001). Some Rana has the highest species diversity compared with species of Ansonia have been clustered and only other genus and spread in Peninsular Malaysia, Borneo, distributed in Peninsular Malaysia or Borneo. The Sumatra, and Java. As the genus with the highest species predicted scenario for this condition is the vicariance diversity and the widest distribution, Rana has some event, the increasing of sea level that caused the species which resulted from speciation (Lim and Leong, separation of area distribution between Peninsular 2004; Tjong et al., 2012). For example Rana siberu which Malaysia and Borneo which occurred at Early-Miocene formerly distributed in Sumatra, including Aceh, (24 – 13 Mya) (Bohlen et al., 2011; Woodruff, 2003). Bengkulu, and West Sumatra (Iskandar and Coljin, 2002), Ansonia then fragmented by mountain and sea barriers species also found in Peninsular Malaysia recently (Lim which lead to the natural selection and genetic drift. and Leong, 2004). Rana siberu firstly described as R. signata complex Microhylidae because of their similarities. R. siberu male then known Microhylidae is a group of small-sized frog which has no nuptial pad. The differences of their morphological has 14% number of total species in Sundaland. This character were predicted as the result of the difference family consists of ±6 genera (Calluella,
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